Verbal Reasoning - Mental Ability Questions

In the following question, correct the equation by interchanging two signs.
4 – 10 x 5 + 9 ÷ 3 = 51

A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.

15, 32, 99, 400, ?

In the following question, select the related letters from the given alternatives.
AGN : IOV : : BLM : ?

A series is given, with one term missing. Choose the correct alternative from the given ones that will complete the series.

(3, 5), (5, 7) ( ? ), (11, 13)

Pranav went 10 Km to the North. Then he turned West and covered 10 Km. Then he turned south and covered 5 Km. Finally, he turned to the East and covered 10 Km. In which direction he is from the starting point?

A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.

IB,QD,XH,DP,?

If "*" denotes "added to", "&" denotes "divided by", "@" denotes "multiplied by" and "%" denotes "subtracted from", then 136 & 8 @ 7 % 3 * 7 = ?

If "A" denotes "added to", "C" denotes "divided by", "D" denotes "multiplied by" and "B" denotes "subtracted from", then
81 C 9 D 11 B 4 A 6 = ?